Question

Formule de calcul prescurtat exrcitii cu paranteze grele rezolvate de cls a 7 a dau punctaj mare.

Answer 1

(5x-7)x[2(x+2)+3(x+1)]-(4x-3)x[3(x+3)+x-6)=
=(5x-7)x(2x+4+3x+3)-(4x-3)x(3x+9+x-6)
=(5x-7)x(5x x 7)-(4x-3)-(4x+3)
=(5x)2(este 5x la a 2)-7 la a 7-[(4x) la a 2-3 la a 2
=25x la a 2-49-16x la a 2+9
=9x la a 2-40